{"id":131860,"date":"2026-08-26T14:34:04","date_gmt":"2026-08-26T14:34:04","guid":{"rendered":"https:\/\/www.seeedstudio.com\/blog\/?p=131860"},"modified":"2026-08-26T15:22:09","modified_gmt":"2026-08-26T15:22:09","slug":"solar-radiation-sensors-thermopile-vs-photodiode","status":"publish","type":"post","link":"https:\/\/www.seeedstudio.com\/blog\/2026\/08\/26\/solar-radiation-sensors-thermopile-vs-photodiode\/","title":{"rendered":"How Strong Is the Sunshine? Two Core Technologies Behind Solar Radiation Monitoring"},"content":{"rendered":"\n<p><em>This article is part of the<strong> Sensor Know-How<\/strong> series where we share different technologies in environmental and weather monitoring. From this, you can get practical information and guidance on wind, solar radiation, and other industrial weather sensors. In this way, you will be able to select the most suitable products for your IoT<em> solutions.<\/em> <\/em><\/p>\n\n\n\n<p>We will focus on solar radiation monitoring in this episode!<\/p>\n\n\n\n<p>Whether you are checking a weather forecast, managing a solar farm, growing high-value fruits in a greenhouse, or managing agrivoltaics that combine agriculture and solar energy, <strong>global solar radiation<\/strong> is something worth watching.<\/p>\n\n\n\n<img decoding=\"async\" src=\"https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/image-81.png\" alt=\"\" data-object-fit=\"cover\" \/>\n\n\n\n<p class=\"has-text-align-center\"><em>(SenseCAP S700-C deployed on agrivoltaics projects<\/em>)<\/p>\n\n\n<hr \/>\n\n\n<p>Put simply, it tells us how much solar energy reaches a given surface over a given period of time. It is commonly expressed as irradiance in watts per square meter (W\/m\u00b2).<\/p>\n\n\n\n<p>But how does an outdoor sensor turn something as intangible as sunshine into a reliable number on a screen?<\/p>\n\n\n\n<p>Behind the scenes, two major sensing approaches do most of the work: <strong>thermopile-based measurement<\/strong> and <strong>photodiode-based measurement<\/strong>. One measures sunlight by sensing heat; the other responds directly to photons. Both are useful, yet they are built for different priorities.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Thermopile Sensors: Measuring Sunlight Through Heat<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"546\" height=\"427\" src=\"https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/Pyranometer.png\" alt=\"\" class=\"wp-image-131861\" srcset=\"https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/Pyranometer.png 546w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/Pyranometer-300x235.png 300w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/Pyranometer-32x25.png 32w\" sizes=\"(max-width: 546px) 100vw, 546px\" \/><\/figure><\/div>\n\n\n<p class=\"has-text-align-center\"><em>(Thermopile Sensors)<\/em><\/p>\n\n\n\n<p>A thermopile pyranometer is the traditional reference instrument for measuring broadband solar irradiance. Think of it as a highly sensitive heat detector: it absorbs incoming radiation, detects the resulting temperature difference, and converts that difference into a small electrical signal.<\/p>\n\n\n\n<p>Its measurement path is straightforward:<\/p>\n\n\n\n<p><strong>Solar radiation \u2192 Heat \u2192 Thermoelectric signal<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How do thermopile sensors work?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A dark sensing surface absorbs radiation.<\/strong> The receiving surface is coated with a highly absorptive material, designed to capture incoming solar energy across a broad spectral range.<\/li>\n\n\n\n<li><strong>The absorbed energy raises its temperature.<\/strong> As the sensing surface warms, it becomes hotter than a reference area inside the instrument.<\/li>\n\n\n\n<li><strong>The temperature difference generates voltage.<\/strong> Through the Seebeck effect, a temperature gradient produces a small voltage. The larger the temperature difference, the stronger the electrical output\u2014and the higher the measured irradiance.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Why are thermopile sensors highly regarded?<\/h3>\n\n\n\n<p>Thermopile sensors can measure solar radiation across a broad spectral range, typically extending from ultraviolet through visible light and into the near-infrared region. This broad and relatively flat spectral response makes them especially valuable where traceable, high-quality radiation data are required.<\/p>\n\n\n\n<p>That is why thermopile pyranometers are widely used in the following scenarios.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reference meteorological stations<\/li>\n\n\n\n<li>Climate and atmospheric research<\/li>\n\n\n\n<li>Solar-resource assessment<\/li>\n\n\n\n<li>Calibration and validation work<\/li>\n\n\n\n<li>High-accuracy photovoltaic-performance studies<\/li>\n<\/ul>\n\n\n\n<p>The trade-off is speed and cost. Because the sensor relies on heat transfer, it needs time to reach thermal equilibrium. Its response is therefore generally slower than that of photodiode-based sensors. Thermopile instruments also tend to be larger, more expensive, and more demanding in terms of calibration and maintenance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Photodiode Sensors: Turning Photons into Electrical Signals<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"320\" height=\"198\" src=\"https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/SenseCAP-S700-C.png\" alt=\"\" class=\"wp-image-131862\" srcset=\"https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/SenseCAP-S700-C.png 320w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/SenseCAP-S700-C-300x186.png 300w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/SenseCAP-S700-C-32x20.png 32w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/><\/figure><\/div>\n\n\n<p class=\"has-text-align-center\"><em>(the photodiode sensor integrated in SenseCAP S700-C industrial compact weather sensor)<\/em><\/p>\n\n\n\n<p>If a thermopile sensor is a careful heat observer, a photodiode sensor is the fast responder.<\/p>\n\n\n\n<p>Instead of waiting for absorbed energy to create a measurable temperature difference, a photodiode converts incoming light into an electrical signal almost immediately. Its measurement path is shorter:<\/p>\n\n\n\n<p><strong>Solar radiation \u2192 Electrical signal<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How do photodiode sensors work?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sunlight reaches a semiconductor.<\/strong> The sensing element is usually made from a semiconductor material such as silicon.<\/li>\n\n\n\n<li><strong>Photons excite charge carriers.<\/strong> When photons strike the semiconductor, they transfer energy to electrons and create mobile charge carriers.<\/li>\n\n\n\n<li><strong>The generated current is measured.<\/strong> More incident light produces a stronger electrical response. The sensor electronics then convert that signal into an irradiance value.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Why are photodiode sensors popular?<\/h3>\n\n\n\n<p>Photodiode-based radiation sensors are compact, low-power, and capable of very fast response\u2014often on the millisecond scale. They are also well-suited to integrated environmental-monitoring devices, where space, power consumption, installation time, and total system cost all matter.<\/p>\n\n\n\n<p>Their key limitation is spectral response. Silicon photodiodes are primarily sensitive to visible and near-infrared wavelengths, rather than the full solar spectrum. As a result, the raw electrical signal does not always match the spectral response of a thermopile pyranometer.<\/p>\n\n\n\n<p>Manufacturers address this through calibration and spectral-correction algorithms. For many practical outdoor applications, a well-designed photodiode sensor can provide highly useful and stable solar-radiation data\u2014especially when the goal is operational monitoring rather than laboratory-grade radiometry.<\/p>\n\n\n\n<p>Common applications for photodiode sensors include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Agricultural and greenhouse microclimate monitoring<\/li>\n\n\n\n<li>Distributed photovoltaic systems<\/li>\n\n\n\n<li>Smart-weather stations<\/li>\n\n\n\n<li>Environmental-monitoring networks<\/li>\n\n\n\n<li>Energy-management applications<\/li>\n\n\n\n<li>Outdoor IoT deployments<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Thermopile Sensor vs. Photodiode Sensor: What are the Differences?<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Feature<\/th><th>Thermopile-based sensor<\/th><th>Photodiode-based sensor<\/th><\/tr><\/thead><tbody><tr><td>Core principle<\/td><td>Converts absorbed radiation into heat, then voltage<\/td><td>Converts incident photons directly into an electrical signal<\/td><\/tr><tr><td>Spectral response<\/td><td>Broadband; suitable for high-quality solar-radiation measurement<\/td><td>Mainly visible and near-infrared; relies on calibration and correction<\/td><\/tr><tr><td>Response speed<\/td><td>Typically slower due to thermal response<\/td><td>Extremely fast, often milliseconds<\/td><\/tr><tr><td>Accuracy priority<\/td><td>Strong choice for reference-grade and research applications<\/td><td>Strong practical performance for operational monitoring<\/td><\/tr><tr><td>Size and integration<\/td><td>Often larger and more specialized<\/td><td>Compact and easy to integrate into multi-parameter devices<\/td><\/tr><tr><td>Power consumption<\/td><td>May be higher, especially with heating or ventilation accessories<\/td><td>Generally low<\/td><\/tr><tr><td>Cost<\/td><td>Usually higher<\/td><td>Typically more cost-effective<\/td><\/tr><tr><td>Typical use cases<\/td><td>Meteorological research, solar-resource studies, calibration<\/td><td>Agriculture, IoT weather stations, distributed PV, environmental monitoring<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Which Pyranometer Should You Choose?<\/h2>\n\n\n\n<p>The question is not which technology is \u201cbetter\u201d in every situation. The question to ask is: <strong>what kind of data do you need, and what will the sensor face in the field?<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Choose a thermopile sensor in the following scenarios:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You need broad spectral coverage and high-quality reference data.<\/li>\n\n\n\n<li>The project involves scientific research, calibration, or standards-based measurement.<\/li>\n\n\n\n<li>Long-term data comparability and traceability are critical.<\/li>\n\n\n\n<li>You have the budget and maintenance resources for a professional pyranometer.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Choose a photodiode sensor in these situations:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You need a fast response, compact size, and low power consumption.<\/li>\n\n\n\n<li>The sensor will be deployed at many distributed sites.<\/li>\n\n\n\n<li>The application focuses on operational decisions rather than reference-grade research.<\/li>\n\n\n\n<li>You want to combine solar-radiation data with other environmental parameters in one device.<\/li>\n<\/ul>\n\n\n\n<p>For example, a national meteorological observatory or solar-resource research project may prioritize a thermopile pyranometer. A smart-agriculture project monitoring microclimates across dozens of greenhouses may benefit more from compact, integrated photodiode-based weather stations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Integration Matters in Outdoor Microclimate Monitoring<\/h2>\n\n\n\n<p>Outdoor monitoring is increasingly moving toward systems that are compact, connected, and easy to maintain.<\/p>\n\n\n\n<p>Rather than installing separate instruments for wind, rainfall, temperature, humidity, pressure, and solar radiation, many projects now use integrated multi-parameter weather sensors. This approach can reduce installation time, simplify cabling, lower maintenance requirements, and make large-scale deployments more practical.<\/p>\n\n\n\n<p>For instance, an all-in-one weather sensor such as the <a target=\"_blank\" href=\"https:\/\/www.seeedstudio.com\/SenseCAP-S700-7-in-1-Compact-Weather-Station-Solar-Radiation-Radar-Rain-p-6587.html\" rel=\"noopener\"><strong>Seeed Studio SenseCAP S700-C<\/strong> Industrial-grade Compact Weather Sensor <\/a>integrates a miniaturized photoelectric radiation-sensing unit with radar rainfall measurement, wind speed, wind direction, temperature, humidity, and other environmental parameters. This makes it easier to collect multiple weather indicators from a single field device while reducing deployment complexity for outdoor monitoring projects.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.seeedstudio.com\/SenseCAP-S700-7-in-1-Compact-Weather-Station-Solar-Radiation-Radar-Rain-p-6587.html\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" width=\"1030\" height=\"773\" src=\"https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/S700-C-1030x773.jpg\" alt=\"\" class=\"wp-image-131870\" srcset=\"https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/S700-C-1030x773.jpg 1030w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/S700-C-300x225.jpg 300w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/S700-C-768x576.jpg 768w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/S700-C-32x24.jpg 32w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/S700-C-1024x768.jpg 1024w, https:\/\/www.seeedstudio.com\/blog\/wp-content\/uploads\/2026\/08\/S700-C.jpg 1400w\" sizes=\"(max-width: 1030px) 100vw, 1030px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Key Takeaways on Pyranometers<\/h2>\n\n\n\n<p>Sunlight may look simple, but measuring it accurately is not. Thermopile sensors and photodiode sensors take two very different paths to answer the same question: <strong>how much solar energy is reaching this location right now?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Thermopile sensor<\/strong> remains the preferred route for broad-spectrum, research-grade measurement.<\/li>\n\n\n\n<li><strong>Photodiode sensor<\/strong> offers speed, compactness, low power consumption, and easier integration for real-world monitoring networks.<\/li>\n<\/ul>\n\n\n\n<p>We hope this article helps you better understand the difference between solar radiation monitoring via measuring <strong>heat<\/strong> and measuring <strong>photons<\/strong>, thus you will have more comprehensive knowledge and information to select the right solar-radiation sensor for your projects.<\/p>\n\n\n\n<p>Welcome to comment or contact us should you have any questions, need our suggestions, or make wishes about the content you want to read or the products you want to see and use!<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article is part of the Sensor Know-How series where we share different technologies in<\/p>\n","protected":false},"author":14,"featured_media":131864,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"iawp_total_views":0,"footnotes":""},"categories":[5557,1,4393],"tags":[2222,5566,4649,5563,5565,4567,1258,5560,5559,3647,3411],"class_list":["post-131860","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-know-how","category-news","category-tech","tag-environmental-monitoring","tag-know-how","tag-microclimate","tag-photodiode","tag-pyranometer","tag-seeed-studio","tag-sensecap","tag-solar-radiation","tag-thermopile-sensor","tag-weather-sensor","tag-weather-station"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How Strong Is the Sunshine? 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